<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Promise自定义封装</title>
  <script src="./promise.js"></script>
</head>

<body>
  <script>
    let p = new Promise((resolve, reject) => {
      resolve("OK")
      // reject('Error')
      // throw 'throw-error'
    })
    // 执行then方法
    const result = p.then(value => {
      console.log(value)
      // return new Promise((resolve,reject)=>{
      //   resolve('success')
      // })
      // 抛出异常
      // throw 'FAIL'
    }, reason => {
      console.warn(reason)
    })
    console.log('then返回结果：', result)
  </script>
</body>

</html>